Web position controlling device for web material treating machines



Dec. 19, 1950 o. L s'rRAuss ETAL WEB POSITION CONTROLLING DEVICE FOR WEB MATERIAL TREATING MACHINES 2 Sheets-Sheet l Filed Dec. 2, 1947 2 sheets-smeet^ 2 Dec. 19, 1950 o. L sTRAUss ETAL wEB PosIIIoN coNTRoLLING nEvIcE FoR WEB MATERIAL TREATING MACHINES Filed Dec. 2, 194'? Patented ce.. i9, 1950 WEB POSITION CUNTROLLING DEVICE FUR WEB MATERIAL TREA'IING MACHINES Urville L. Strauss and Clarence .1. Wegner, lLa

Porte, Ind., assignors to Allis-Chalmers Manufacturing Company, Milwaukee, Wis., a corporation of Delaware Application December 2, 1947, Serial No. 789,342

7 Claims.

This invention relates generally to material 'treating machines and more particularly to a machine for cutting sheet material into desired lengths after the edges of the material have been folded over and fastened.

In the prior art, a great deal of laborious time consuming hand work was required to fold over the edges of sheet material, fasten down the folds and cut the material to desired length. In fact. it has been customary to measure sheet material, to cut off the material to desired length, to fold over and fasten one fold, and then to fold over and fasten the opposite fold. This resulted in a product which was difficult to control as to uniformity, if the sheet material varied in width.

It is, therefore, an object of this invention to provide a machine for centering sheet material, for simultaneously folding over two opposite edges of the material with uniformly equal folds and in which the width of the material after folding is kept constant, despite variations in the width of the sheet material.

Another object of this invention is to provide a machine for centering sheet material of uniform width, for folding over two opposite edges of the material with folds of equal width, for simultaneously fastening the folded portions to the body of the material and for automatically cutting oil` predetermined lengths of the fastened material.

Another object of this invention is to provide means for centering continuous sheet material otherwise known as a web of varying width and varying center line as the material moves through a machine.

In this connection, the construction, application and operation of apparatus embodying the invention, and the advantages afforded thereby, will become readily apparent as the disclosure progresses and more particularly points out additional objects, features of construction and combinations of elements and parts considered of special importance.

And accordingly the invention may be considered as consisting of the various combinations of elements and parts constructed and/or correlated as is more fully set forth in the detailed description and in the appended claims, reference being had to the accompanying drawings illustrating an embodiment of the invention and in which:

Fig. 1 is a plan view of a material treating machine embodying the invention with some parts omitted for clarity;

Fig. 2 is a side elevation of the structure shown in Fig. 1 with some parts removed for clarity.

E Fig. 3 is a section view taken on line III- of Fig. 1;

Fig. 4 is an enlarged diagrammatic plan oi. the centering means of Fig. l.; and

Fig. 5 is a diagrammatic view of the balance of the operating means of the embodiment of the invention which is not shown in Fig. 4.

Reference is made to the copending application of Orville Strauss filed November 28, '1947, Serial No. 788,437, for a Folding Machine. This application claims the folding device itself, which is here included as an element in combination.

Referring particularly to Figs. l and 2 of the drawings, it is seen that for purpose of illustration the invention is shown as applied to a material or web treating machine for treating 'a fabric material including a centering and folding assembly 6, a fastening assembly "i, and a material measuring and cutting assembly 8.

Assembly 6 consists of a carriage member 9 rotatably supporting a cylindrical member Il which supports a. roll of fabric material. One of the lower ends of carriage member 9 is laterally movably supported on roller bearings I2 and i3 which are supported by cross member I4 carried by the side walls i8 and l1. The other lower'end of carriage member 9 is drivingly connected for lateral movement to a. motor i8 by means of a gear connection I9 carried by cross member 2i. Carriage member 9 is additionally supported for lateral movement by roller bearing 22 carried by cross member 23 rigidly supported by sidewalls i6 and i1. A roll 24 is rotatably supported by end portions of carriage 9. Continuous sheet material as it unwinds from a roll of material supported by carriage 9 passes over and rides on roller 24, passes over floor plate 26 betweenv spreader rolls 21 and'28, through folding device 28 and between flattening feed rolls 3| and 32.

Floor plate 26 is carried by side walls i6 and I1 and has apertures therein through which centering control structures 33 and 34 contact the edges of the material passing over floor plate 28 and through which switch element 36 ordinarily con'- tacts a mid portion of the material. Reference is had to Fig. 4 which shows the controls of the centering mechanism in greater detail. Control structures 33 and 34 are threadedly engaged with shaft 31 for lateral movement toward or away from each other. Shaft 31 is rotatablysupported by side walls I6 and i1. These controls are so mounted that they are always equal distances from the longitudinal center line of the machine. The threads on shaft 31 engaged with structure 33 are opposite to the threads on shaft 31 engaged with structure 34. Control structure 33 pivotally mounts a member 33 which is spring biased inward toward control structure 34. On member 33 is mounted a guide member 33 which is designed to ride on the edge of material as it passes through the machine. 'I'he lower end of pivoted member 33 is positioned between two pair of electrical contacts 4| and 42. As shown in Fig. 4, pivoted member 38 is in a neutral position Wherein neither pair of contacts is closed. Assume that the material is too narrow in width which would result in the spring biased member moving clockwise about its pivot point and thereby closing contacts 4I if the movement is of sufficient extent. With contacts 4I closed one of the held windings of motor 43 is actuated to drive motor 43 in a direction to rotate shaft 31 through worm gear connection 44 to shift control structures 33 and 34 towards each other until pivoted member 33 again reaches a LMitral position. Now assuming that the material is of greater width than normal, then the edge of the material will cause member 38 through guide 39 to pivot in a counterclockwise direction and if the material is suiliciently oversize, contact 42 will be closed. Then the other iield winding of motor 43 will be enu ergized to drive motor 43 in the opposite direction resulting in a rotation of shaft ,31 to move control structures 33 and 34 apart until pivoted member 38 regains a neutral position breaking contact 42.

When the roll of material is exhausted and no material remains to contact guide member 33, the spring bias causes pivoted member 38 to pivot clockwise thereby closing contact 4| resulting in control structures 33 and 34 moving toward each other until the upper end o! member 33 contacts stop member 46 and the contact 4I is opened and member 38 is in a neutral position. This stop member 46 is provided so that the control structures 33 and 34 will not over travel every time a roll of material is used up. Contact 41 is mounted on shaft 43 at an angle diierent from the angle at which contact 46 is mounted on shaft 48. Shaft 48 is rotatably carried by side walls I 6 and I1. Contact 41 is moved into operating position by rotating shaft 48 whenever the size of material is changed to correspond to the need of a stop member in that position. Any number of stop members may be mounted on shaft 43 corresponding to the different widths of material to be worked.

Control structure 34 pivotally mounts a member 49 which is spring biased inward toward conthe above variations.

trol structure 33. On member 49 is mounted a guide member 5I which is designed to ride on the edge of material as it passes through the machine. The lower end of pivoted member 49 is positioned between two pair of electrical contacts 52 and 53. As shown in Fig. 4, pivoted member 49 is in a neutral position wherein neither pair of contacts is closed. Assume that material of the proper width has ybeen wound improperly so that as it passes the control structures 33 and 34 the material tends to move inwardly and away from control member 34. Upon suiiicient movement, with guide member 5I following the edge of the material, the lower end of pivoted member would close contacts 53 energizing one of the field windings of motor I8 which through worm gear connection I9 would drive carriage 9 toward side wall I6 until the material passing between control structures 33 and 34 caused member 49 to move into a neutral position. Now assuming that material of the proper width has been wound up improperly so that as the material ,one half the width of the material. -34 would then take care of any unevenness in passes control structure 34 it tends to pivot member 49 in a clockwise direction. With sufficient movement member 49 closes contact 52 which actuates the other 'field winding of motor I3 to move carriage 3 toward side wall I1 until member 49 reaches a neutral position as the material is moved toward side wall I1.

Whenever there is material passing over floor plate 2B, this material will bias switch 36 downward to keep the power side of the circuits connected to control structure 34 operative, subject to contacts 52 or 53 being closed. When there is no material on floor plate 26 switch 38 remains open and the circuits of control structure 34 remain inoperative. This is to do away with needless shifting of the carriage 3 when there is no material that requires centering.

The actuation of the control structures 33 and 34 have this far been described as though they were making individual adjustments for variations in the material. As a matter of fact, the two structures often work together to compensate each other. For example, assume that the material in the roll has been improperly rolled being too close to side wall I1, as it is leaving the roll and that the material is also too wide. Then control structure 33 would move thestructures 33 and 34 apart to compensate for both This would result in an over compensation of structure 34 and structure 34 would start moving carriage 9 toward side wall IB. Then as the edge of the material contacted by structure 33 receded toward side wall I6. structure 33 would cause structures 33 and 34 to move toward each other which would continue until structure 33 reached a neutral position; then if structure 34 is in a neutral position, actuation between structures Will cease. If structure 34 is not in a neutral position, then structure 34 would continue moving carriage 9 toward side wall I6 until structure 34 reached a neutral position or structure 33 was again actuated to move the structures 33 and 34 toward each other. In other words, the structures 33 and 34 tend to compensate each other until both end up in a neutral position and that neutral position will be such that the center line of the material passing between structures 33 and 34 will be approximately above the longitudinal center line of the machine.

If material could be purchased at a reasonable figure that had a constant width, the control structure 33 would not be necessary. -With materials of constant width, the control structure 34 could be placed at a iixed point from the longitudinal axis of the machine, a distance equal to Structure the rolling of the material. However, as most commercial material is supplied with variations in width and in which the layers of material in the roll overlap or underlap the adjoining layers of material, control structures 33 and 34 are provided to correct both conditions.

It is to be noted that in both structures 33 and 34, that there is clearance between the contacts and the pivoted member. The amount of clearance permitted determines the degree of accuracy of the centering means.

As the centered material leaves floor plate 26, it enters between spreading rolls 21 and 29. These rolls are rotatably supported by side walls I3 and I1. These rolls are not driven but merely rotate as the material is drawn between them. Upper roll 21 is so mounted that vertical movement thereof is permitted by sidewalls i6 and i1. This vertical movement of -upper roll 21 is controlled by yoke members 54 which partly encircle portions of the shaft of upper roll 21 adjacent sidewalls |6 and l1. Yoke members 54 are pivotally mounted on side walls |8 and |1 with their lower ends spring biased compressing upper roll 21 against lower roll 28. The degree of compression exerted between the rolls may be varied by means oi cranks 56 which are pivotally mounted on side walls i5 and |1. Attached to the cranks 56 are eccentric members 51 which engage side surfaces of yokes 511 when cranks are turned. The spreading rolls 21 and 28 smooth any wrinkles out of flexible material passing between and cause the sheet material to lay at as it enters the folding device 29.

The folding device 29 comprises two longitudinally extending elongated symmetrical side members 58 and 59, respectively, having opposed gradually developing curved surfaces. Side members 58 and 59 are slidably supported on rodlike members 8| carried by side walls I8 and l1. An adjusting rod 52 is threadably engaged with side members 58 and 59 and rotatably supported by side walls i8 and i1. On one end of adjusting rod 62 is attached an adjusting wheel 53. As indicated in Fig. l the opposite ends of rod 82 are threaded in opposite directions so that when rod 82 is revolved by rotating wheel 83, members 58 and 59 move toward or away from each other depending on the direction of rotation of wheel 53. By adjusting wheel 63 in the proper direction,-the side members 58 and 59 can be positioned for handling various widths of material. Side members 58 and 59 are always equal distant from the longitudinal axis of the machine for all positions of adjustment. Attached to the side member 58 is a bottom or material supporting and guiding member consisting of a substantially horizontal mid-portion 84 and two end portions 86 and 81 longitudinally joined thereto and extending upwardly therefrom. Attached to the side member 59 is a like bottom or material supporting and guiding member consisting of three portions, a substantially horizontal center portion 88 and two end portions 59 and 1| longitudinally joined thereto and extending upwardly therefrom.

Mounted on rods 8|, is an auxiliary bottom or material supporting and guiding member consisting of a substantially horizontal center section 12 and two end portions 13 and 14, longitudinally joined thereto and extending upwardly therefrom. The bottom portions attached to side members 58 and 59 are telescopically arranged with the auxiliary bottom member to slide thereover when the spacing between side members 58 and59 is varied as is best illustrated in Fig. 3.

sidewalls i5 and i1 rotatably support opposite ends of a pair of feed rolls 3| and 32 which are positioned adjacent the discharge ends of side members 58 and 59. Rolls 3| and 32 are driven by a gear box 18 through conventional means. Upper roll 3| is so mounted that vertical movement thereof is permitted by side Walls i6 and |1. This vertical movement of upper roll 3| is controlled by yoke members 11 which partly encircle portions of the shaft of upper roll 3| adjacent sidewalls i5 and |1. Yoke members 11 are pivotally mounted on side walls I6 and |1 with their lower ends spring biased compressing upper roll 3| against lower roll 32. The degree of compression exerted between the rolls may be varied by means of cranks 18 which are pivotally mounted on sidewalls'i and i1. Attached to the cranks are eccentric members 19 which engage side surfaces vof yokes 11 when cranks 18 are turned. The feed rolls 3| and 32 draw the material from the material roll supported in carriage member 9, between the centering structures 33 and 34 and through the folding device 29. The material contacting surfaces of rolls 3| and 32 are knurled (not shown) to aid in gripping the material therebetween.

The folded material leaves the rolls 3| and 32 and passes over a table member 8|, carried by side walls I6 and Il, to a position where the folds of the material may be simultaneously fastened down. As the material shown here for purposes of illustration is fabric material, the fastening means employed are sewing machines. Frame structures 82 and 83 laterally movably support sewing machines 84 and 88, respectively. And sewing machines 88 and 86 removably support sewing machine material pullers 81 and 88, respectively. Sewing machines 84| and 88 are threadedly engaged with opposite ends of a rod 85 which is rotatably supported by frame structures 82 and 83. The threads of rod 85 engaged with sewing machine 88 being opposite to the threads engaged with sewing machine 88. Then as rod 85 is rotated by a hand wheel 90 attached thereto, the sewing machines may be moved toward or away from each other depending on the direction of movement of wheel 90. By manipulation of handwheel 90, the sewing machines 88 and 88 may be adjusted to handle various widths of material. At all times sewing machines 88 and 86 will be equal distant from the longitudinal axis of the machine. The folds of the material pass under the sewing heads of sewing machines 84 and 86 and both folds are simultaneously sewedto the underlying material. In handling heavy fabric material, the pulling mechanisms in the sewing machines often do not exert sufficient pull on the material so that auxiliary pulling devices 81 and 88, which are coordinated with the pulling devices in the sewing machines, are added to pull the material through the sewing machines with the proper intermittent motion which is well known in the sewing art. The pulling means in devices 81 and 88 consists of a pair of driven knurled rolls.

The sewing machines 84 and 86 and pullers 81 and 88 are all driven by the same source of power so that their action is coordinated. Reierence is had to Fig. 5 which diagrammatically shows this power system. Sewing machines 84 and 86, which directly drive pullers 81 and 88, respectively, are driven by a common rotating shaft 89 through conventional belts and pulleys.

Shaft 89 is drivenly connected to shaft 9| by conventional means. Shaft 9| is driven by fly- Wheel 92 through clutch 93. Flywheel 92 is driven by motor 94 through a speed changing device 95. The lower end of shaft 9| is drivingly connected to a gear box 91 which drives shafts 98 and 99. Shaft 98 is drivingly connected to gear box 16 which drives feed rolls 3| and 32. As feed rolls 3| and 32 are driven by the same source (motor 94) as the sewing machines, any change in speed of motor 94 will affect the speed of the sewing machines and the feed rolls equally.

As the sewed material leaves the sewing machine pullers, the sewed material is engaged between tension measuring rolls |0| and |02 which are rotatably supported by side walls |03 and |04. Rolls |0| and |02 are drivenly connected to gear box which is driven by shaft 98. And it is seen that measuring rolls |0| and |02 are driven by the same source as the sewing machines and the feed rolls, thereby causing the material to flow smoothly through the entire machine. As the material leaves the tension measuring rolls |0| and |02, the material passes over stationary blade assembly |01 carried by side walls |03 and |04. Rotatably mounted above stationary blade |01, by walls |03 and |04, is a shear blade assembly |08. Attached, to a lower edge of stationary blade |01, is a guide member |09. Through a one revolution clutch of conventional design rotary shear blade |08 is drivenly connected to a flywheel ||2 which is continuously driven by motor IIS.

A material cut-off mechanism is mounted on side wall |04 and is drivenly connected to lower tension measuring roll |02 by means of an endless chain ||4. Control mechanism ||5 comprises a compound sprocket ||6 drivenly connected to endless chain ||4. Sprocket ||6 drives an endless chain ||1 which passes around sprocket H0, and adjustable sprockets ||9 and |2|. On chain ||1 is attached a member |22 which, upon passing a stationary element |23, contacts the lower arm of a bell crank member |24 causing the bell crank member |24 to pivot about point |26 in a counterclockwise manner so that the biased end of the bell crank member |24 closes contacts |21. With contacts |21 closed, power source activates solenoid |29 to draw cylinder |3| thereinto. This movement of cylinder |3| causes bell crank |32 to pivot clockwise about its pivot point |33 and release clutch so that rotary blade |08 is driven by flywheel I l2 through a revolution. In the course of this revolution material passing over stationary blade |01 is severed between stationary blade |01 and rotary blade |08 and drops down material guide |09. After member |22 has actuated rotary blade |08 to sever the material, member |22 passes by bell crank |24 permitting it to assume its biased position thereby opening contacts |21 and breaking the circuit so that solenoid |29 is no longer operative to maintain cylinder |3| therein and thus permitting bell crank |32 to assume its biased position retaining clutch and rotary blade in inoperative position. When member |22 has again made a complete circuit about sprockets IIS, |2|, ||6 and ||8, bell crank |24 will again be tripped and the cutting process again initiated. Chain ||1 is of sufficient length and is driven at a desired speed so that the material is cut to the desired length. If material of different length is required, the chain |11 can be lengthened or shortened and the tautness of the chain can be adjusted by raising or lowering sprockets ||9 and |2|.

The operation of the machine has been largely included in the foregoing description and will be but briefly described here. Sheet material unwinds from a roll rotating in carriage member 9 and passes over roller 24 over floor plate 26 between' guicle members 39 and 5| which actuate the control structures 33 and 34 to center the material in the machine. The centered material enters between rolls 21 and 28 which smooth out wrinkles and cause the centered material to lay fiat as it enters the folding device 29. As the material enters the folding device 29, the outer edges of the material contact the gradual curving surfaces of the side members 58 and 59 and as the material is drawn along and between members il and 59 the portions of the material in contact with the curved surfaces are gradually successively curved outwardly, upwardly and in wardly with respect to the center line of the material until the edges are folded back on the ma terial.l While the edge portions of the material are contacting the curved surfaces of members 58 and 59, the center portion of the material, not in contact with the curved surfaces, goes down the inclined surface formed by end portions 66, 13 and 1|, over the surface formed by center portions 84, 12 and 68 and up the inclined surface formed .by end bottom portions 81, 14, and GI. As the folded material emerges from the folding device 29, it is gripped between the power driven feeding rolls 3| and 32 which draw the material through the centering means and the folding device with a predetermined speed and tension. The correlation between the bottom members and the curved portions in the side member is such that a portion of the material being acted upon by the curved surfaces of the side members 58 and 59 traverses the same distance in passing through the folding device 20 as a center portion of the material does in passing over the three planed bottom portion.

As the material leaves the feed rolls 3| and 32 with opposite edges folded over, the folded portions of the material pass under the sewing heads of the sewing machines 34 and 86 which sew the fold to the underlying material. The material is drawn through the sewing machines by the pullers in the sewing machines and by auxiliary pullers 01 and 88. After leaving the sewing machine pullers, the sewed material enters between power driven measuring rolls |0l and |02. These rolls grip the material and feed the material on over the stationary blade |01 and down onto a material guide |09. After rolls |0| and |02 have revolved sufflcient times to move the element |22 through a complete revolution of its circuit, rotary knife |08 is actuated to coact with stationary blade |01 to sever the material at a predetermined length.

In general, the construction herein shown and described embodies correlations of features for severally and/or collectively accomplishing in whole or in part one or more of the aforesaid objects and advantages and it should be understood that although the invention is particularly applicable to working with rolled fabric material, certain features and correlations thereof are of more general application and may be applied to use with other and different types of material, and therefore it is not desired to limit the invention to the exact details of construction, correlation of elements, and arrangement of parts herein disclosed for purposes of illustration as various modifications within the scope of the appended claims may occur to persons skilled in the art.

It is claimed and desired to secure by Letters Patent:

l. In a machine adapted to feed a web longitudinally therethrough, the improvement comprising a web supplying carriage transversely movably connected relative to the machine, transversely spaced web edge contacting members positioned at equal distances from a plane extending longitudinally of the machine in generally normal relation to the web passing therethrough and supported for movement toward and away from said plane, means biasing said members toward said plane, said members being movable in response to variations in the transverse position and width of a web as it passes assenso y 9 through the machine, means responsive to the movement of one of said members for transversely moving said carriage, and means for transversely shifting both of said members toward or away from each other in response to a movement of the other of said members.

2. In a machine adapted to feed a web longitudinally therethrough, the improvement comprising a web supplying carriage transverselymovably connected relative to the machine, oppositely disposed web edge contacting members spaced equal distances from the longitudinal axis of the machine and supported for movement toward and away from said axis, means biasing said members toward each other, said members being movable in response to variations in the transverse position and width of a web as it passes through said machine, means responsive to the movement of one of said members for transversely moving said carriage in a direction generally opposite to the direction of the movement of said one of said members, and means for transversely shifting both of said members toward or away from each other in response to the movement of the other of said members.

3. In a machine adapted to feed a web longitudinally therethrough, the improvement comprising a web supplying carriage transversely movably connected to the machine, transversely spaced web edge contacting members positioned en the machine at egual distances from the vlongitudinal axis thereof? and supported :lor movement toward and away from said axis, means biasing said members toward the longitudinal axis of said machine, said embers being mov able in response to variations in the transverse position and width ci? the web as it passes through said machine, means responsive to the movement oi one of said members for transversely moving said carriage a distance substantially equal to the distance moved by said one of said members, and means for transversely shifting both of said members toward or away from each other in response to the movement of the other of said members.

li. lin a machine adapted to feed a web longitudinally therethrough, the improvement comprising a web supplying carriage transversely movably connected to the machine, web edge contacting members mounted on the machine at equal distances from the longitudinal axis thereof. in position to contact the opposite longitudinal edges of a web passing through the machine, means biasing said members toward the longituolinai axis of said machine, said members being supported for movement toward and away from said axis in response to variations in the transverse position and width of the web passing through said machine, means responsive to the movement of one oi said members for trans versely shifting said carriage a distance substantially equal to the distance moved by said one oi said members, and means for transversely shifting said members simultaneously toward or away from the longitudinal axis of said machine -in response to the movement of the other of said members.

5. In a machine adapted to feed a web longitudinally therethrough, the improvement comprising a web supplying carriage transversely movably connected to the machine, web edge contacting members spaced equal distances from the longitudinal axis of said machine in position to contact the opposite longitudinal edges of a web passing through the machine, means biasing dit said members toward said axis, said members being supported for movement toward and away from said axis in response to variations in the transverse position and width of the web as it passes through the machine, means responsive to the movement of one of said members for transversely shifting said carriage in a direction generally opposite to the direction of movement of said one of said members and for a distance proportionate to the amount of said movement, and means for simultaneously transversely shifting in equal increments both of said members toward or away from each other directly in response to the movement of the other of said members toward or away from said axis, said shifting being proportionate to the amount of movement of the other of said members.

6. In a machine adapted to feed a web longitudinally therethrough, the improvement comprising web centering means including a web supplying carriage member transversely movably carried by said machine, driving means for mov= ing said carriage in directions transverse to the longitudinal axis oi said machine, a pair of con trol structures transversely movably supported on said machine, the first of said structures haviing a pivotally mounted member with one end thereof biased inward toward said other struc ture and adapted to contact a longitudinal edge of the web passing through the machine and to be positioned thereby, said first structure having its pivotally mounted member connected with said driving means for controlling the transverse movement of said carriage member in response to the position of said pivoted member, said other structure having a pivotally mounted member biased inward toward said iirst structure and adapted to contact the opposite longitudinal edge of the web passing through the machine and to be positioned thereby, and means for moving said structures toward or away from each other while maintaining said structures equidistant from the longitudinal axis of said machine, said other structure having its pivotally mounted member connected with said moving means for controlling same in response to the position of the pivoted member thereof.

7. ln a machine adapted to feed a web' longitudinally therethrough, the improvement comprising web centering means including a web supplying carriage member transversely movably carried by said machine, driving means for mov ing said carriage in directions transverse to the longitudinal axis of said machine, a pair of con trol structures transversely movably supported on said machine, the first of said control structures having a pivotally mounted member with one end thereof biased inward toward said axis and adapted to contact a longitudinal edge of the web passing through the machine and to be pivotally positioned thereby, said first structure having its pivotally mounted member connected with said driving means for controlling the direction and amount of transverse movement oi' said carriage member in response to the direction of and amount of movement of said pivoted member, said other structure having a pivotally mounted member biased toward said axis and adapted to contact the opposite longitudinal edge of the web passing through the machine and to be pivotally positioned thereby, and means for moving said structures toward or away from each other while maintaining said structures equidistant from said axis, said other structure having its pivotalLv mounted member connected with said moving memes REFERENCES CITED The following references are of record in the file of this patent:

Number 12 UNITED STATES PAI'ENTS Name Date Fish June 4, 1907 Walkup Apr. 13, 1915 f Montforts et al. May 10, 1932 Brackett et a1 May 10, 1932 Morrill et ai ,L May 31, 1932 Roesen Feb. 7, 1933 Andreotto Oct. 6, 1942 Krieger Jan. 19, 1943 Haugh July 1, 1947 

